A chronic inflammatory disease of the central nervous system (CNS) resulting in focal loss of myelin and therefore loss of neuronal activity. MS can cause a variety of symptoms, including changes in sensation, visual problems, muscle weakness, depression, difficulties with coordination and speech, severe fatigue, short term memory loss, problems with balance, overheating and pain. MS causes impaired mobility and disability in more severe cases. MS may take several different forms, with new symptoms occurring either in discrete attacks or slowly accruing over time. Between attacks, symptoms may resolve completely, but permanent neurological problems often persist. The exact cause of MS remains unknown and the disease has no cure. MS primarily affects adults, its age of onset typically is between 20 and 40 years (cf. Section 2.4.5).
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Have you ever been envious of people who seem to have no end of clever ideas, who are able to think quickly in any situation, or who seem to have flawless memories? Could it be that they're just born smarter or quicker than the rest of us? Or are there some secrets that they might know that we don't?